Operator

..<(_:)

Returns a partial range up to, but not including, its upper bound.

Declaration

prefix static func ..< (maximum: Measurement<UnitType>) -> PartialRangeUpTo<Measurement<UnitType>>

Parameters

maximum

The upper bound for the range.

Discussion

Use the prefix half-open range operator (prefix ..<) to create a partial range of any type that conforms to the Comparable protocol. This example creates a PartialRangeUpTo<Double> instance that includes any value less than 5.0.

let upToFive = ..<5.0

upToFive.contains(3.14)       // true
upToFive.contains(6.28)       // false
upToFive.contains(5.0)        // false

You can use this type of partial range of a collection’s indices to represent the range from the start of the collection up to, but not including, the partial range’s upper bound.

let numbers = [10, 20, 30, 40, 50, 60, 70]
print(numbers[..<3])
// Prints "[10, 20, 30]"

See Also

Operating on a Measurement

static func != (Measurement<UnitType>, Measurement<UnitType>) -> Bool

Returns a Boolean value indicating whether two values are not equal.

static func <= (Measurement<UnitType>, Measurement<UnitType>) -> Bool

Returns a Boolean value indicating whether the value of the first argument is less than or equal to that of the second argument.

static func > (Measurement<UnitType>, Measurement<UnitType>) -> Bool

Returns a Boolean value indicating whether the value of the first argument is greater than that of the second argument.

static func >= (Measurement<UnitType>, Measurement<UnitType>) -> Bool

Returns a Boolean value indicating whether the value of the first argument is greater than or equal to that of the second argument.